Quote Originally Posted by Kamikaze View Post
But just because the majority of one's income is from whatever it is they're doing shouldn't be the sole factor in deeming one a professional. They can be under-qualified and still make money from it.

Would you go to a doctor just because he/she is making money? I would hope the fact they know what they're doing would be a consideration.
From the dictionary:
Professional - a person who earns a living in a sport or other occupation frequently engaged in by amateurs
Amateur - a person who engages in a study, sport, or other activity for pleasure rather than for financial benefit or professional reasons

I would hope that people research the background of anyone that they might hire, and choose appropriately. Target photographers are professionals, as in that is their source of income, but it is unlikely that they would know how to properly photograph a wedding event. Different skills are needed in different areas.